Seeds of South Australia
Logania recurva (Loganiaceae)
Recurved Logania
List of species for Logania
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Seed collecting:
October to December
Herbarium region:
Southern Lofty
NRM region:
Adelaide and Mount Lofty Ranges
IBRA regions
Fleurieu (KAN02)Kanmantoo
 Rare   (IUCN: RA d(ii))   (Probable Decline)   [very little regeneration; comes & goes; smut attacks]
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Near Threatened   (Probable Decline)   [very little regeneration; comes & goes; smut attacks]
RSCA map:
Regional Species Conservation Assessments per IBRA subregion. Please click the thumbnail map.
AVH map:
Australian distribution map (external link)
SA Census:
Census of South Australian plants (external link)     [genus Logania]
Name derivation:
Logania named after James Logan (1674-1751), an Irish born botanist who emigrated to North America, became Governor of Pennsylvania and wrote a book on the sexuality of plants. Recurva from the Latin 'recurvare' meaning to bend back; referring to its curved leave margins.
Distribution:
Endemic to South Australia and found in the southern Mount Lofty Ranges, growing in low Eucalyptus obliqua forest with heath understorey.
Status:
Native. Uncommon in South Australia.
Plant description:
Erect shrub to 1 m high, dioecious, stems glabrous to minutely hairy. Leaves linear to narrowly ovate, narrowing at the base, to 40 mm long and 8 mm wide, glabrous to minutely hairy, margins recurved to revolute. Inflorescence in terminal compact clusters with white unisexual flowers. Flowering between August and October. 
Fruit type:
Orange-brown ovoid capsule to 6 mm long and 4.5 mm wide. 
Seed type:
Shiny black convex seed to 1.3 mm long and 0.8 mm wide, with a reticulated surface.
Embryo type:
Linear fully developed.
Seed collecting:
Collect maturing capsules, those that are fat, turning orange-brown in colour, have not open and contain hard black seeds.
Seed cleaning:
Place the capsules in a tray and leave to dry for one to two weeks for it to split. Then rub the capsules gently with a rubber bung to dislodge the seeds. Use a sieve to separate the unwanted material. Store the seeds with a desiccant such as dried silica beads or dry rice, in an air tight container in a cool and dry place.
Seed viability:
From three collections, the seed viability was high, ranging from 85% to 95%.
Seed germination:
Seeds have morphophysiological dormancy, germination was enhanced after treatment with fire cues (dry heat and smoke water) and gibberellic acid.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA8100 (1.95 g)<303-Dec-2007RJB74289
Southern Lofty
19-Sep-200895%-18°C
Location: BGA — the seeds are stored at the Adelaide Botanic Gardens, MSB — the seeds are stored at the Millennium Seed Bank, Kew, England.
Number of plants: This is the number of plants from which the seeds were collected.
Collection location: The Herbarium of South Australia's region name.
% Viability: Percentage of filled healthy seeds determined by a cut test or x-ray.
Germination table:
DateResultT0T50Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod
Feb 201888%21 d28 d 900 mg/L gibberellic acid for 24 h;
1% agar;
Incubated under spring/autumn conditions
Feb 201878%21 d28 d 900 mg/L gibberellic acid for 24 h;
1% agar;
Incubated under winter conditions
Feb 201866%21 d35 d dry heat 100°C oven 15 min, 900 mg/L gibberellic acid + 10% smoke water for 24 h;
1% agar;
Incubated under winter conditions
Feb 201862%21 d35 d dry heat 100°C oven 15 min, 900 mg/L gibberellic acid + 10% smoke water for 24 h;
1% agar;
Incubated under spring/autumn conditions
Feb 201852%28 d42d dry heat 100°C oven 15 min, 10% smoke water for 24 h;
1% agar;
Incubated under spring/autumn conditions
Feb 201842%21 dNA 10% smoke water for 24 h;
1% agar;
Incubated under spring/autumn conditions
Feb 201840%28 dNA dry heat 100°C oven 15 min, 10% smoke water for 24 h;
1% agar;
Incubated under winter conditions
Feb 201840%28 dNA 10% smoke water for 24 h;
1% agar;
Incubated under winter conditions
Feb 201812%35 dNA leached in water 24 h;
1% agar;
Incubated under spring/autumn conditions
Feb 20182%35 dNA leached in water 24 h;
1% agar;
Incubated under winter conditions
Result: Maximum percentage of germination observed.
T0: Number of days before first germinant observed.
T50: Number of days to achieve 50% germination.
Pre-treatment: The initial treatment that the seeds received prior to placement on germination media.
Germination medium: The substrate that seeds were placed on for the duration of the germination experiment.
Incubator conditions:
Photoperiod: The duration of light exposure that the seeds were subject to during a 24 hour period.
Thermoperiod: The constant or diurnal temperatures that seeds were subject to during a 24 hour period.
Winter conditions: 15°C 20 h (3am→11pm); 5°C 4 h (11pm→3am) / 10 h light (8am→6pm); 14 h dark (6pm→8am)
Spring/Autumn conditions: 22°C 12 h (8am→8pm); 10°C 12 h (8pm→8am) / 12 h light (8am→8pm); 12 h dark (8pm→8am)
Summer conditions: 30°C 14 h (6am→8pm); 15°C 10 h (8pm→6am) / 14 h light (6am→8pm); 10 h dark (8pm→6am)